Suggestion to reverse string in c#

Answer 1

You should use a StringBuilder rather than just string aggregation, especially if this is going to be used a lot.

You can also use String.Join() to put a delimited string array back together.

Answer 2

Yes that seems to be ok.

About StringBuilder:
No need to use StringBuilder unless there are usually more than 4-5 elements after the split. If there are usually less than that then aggregation is fine.

Answer 3

How about:

String.Join(" « ", "Products » X1 » X3".Split(new[]{" » "}, 
    StringSplitOptions.None).Reverse().ToArray());

EDIT: The updated version version will work if the components contain spaces (e.g. "Foo Products » X1 » X3")